Description Item ESS DUAL Engine Sound SimulatorSize About 80 44 44mmCompatible with Axial SCX 10 SCX 10 II WRAITH Traxxas TRX4Feature Short circuit overload over current and thermally protected Full RPM range linear sound synthesisAdvanced NDSDTS technology Intelligent state tracking compensationSimulates the sound of engine starting brakes blow off valve red line fuel cut gear shiftingMore sound available from RC Plus APPUSB updatability For more information Instructions Installation please click 1 2 Package Included 1 x ESS DUAL Engine Sound Simulator